<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="good in cartList" :key="good.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list"
            :checked="good.isChecked === 1"
            @click="SingleChecked(good.skuId, good.isChecked === 1 ? 0 : 1)"
            >
          </li>
          <li class="cart-list-con2">
            <img :src="good.imgUrl">
            <div class="item-msg">{{good.skuName}}</div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{good.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="changeNum(good,-1)">-</a>
            <input autocomplete="off" type="text"  :value="good.skuNum" minnum="1" class="itxt">
            <a href="javascript:void(0)" class="plus" @click="changeNum(good,1)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{good.skuPrice*good.skuNum}}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet"
            @click="deleteSingle(good.skuId)"
            >删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="allChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAll">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{allNum}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{allPrice}}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" href="###" target="_blank">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import { reqCartAllChange, reqCartAllDelete, reqCartList, reqCartSingleChange, reqCartSingleDelete, reqAddOrUpdateCart } from "@/api";
  export default {
    name: 'ShopCart',
    data(){
      return{
        cartList:[]
      }
    },
    mounted(){
      this.getCartList()
    },
    methods:{
      //1.获取购物车列表的数据
    async getCartList() {
      const result = await reqCartList();
      // console.log(result);
      this.cartList =
        result[0]?.cartInfoList.map((item) => {
          item.isReq = false;
          return item;
        }) || [];
    },

    //2.修改单个的选中状态
    async SingleChecked(skuID, isChecked){
      await reqCartSingleChange(skuID, isChecked)

      this.getCartList()
    },

    //3.删除单个商品
    async deleteSingle(skuId){
      await reqCartSingleDelete(skuId)

      this.getCartList()
    },
    //4. 删除已经选中的所有商品
    async deleteAll() {
      //先得到所有已经选中的商品的skuId组成的数组
      const skuIdList = this.cartList.reduce(
        (p,c) => (c.isChecked == 1 ? [...p , c.skuId] : p),[]
      );
      console.log(skuIdList);
      
      await reqCartAllDelete(skuIdList);
      //重新发送请求
      this.getCartList();
    },

     //5. 点击加减按钮修改商品数量
    async changeNum(good,num){
      //如果正在发送请求 则直接return不再操作
      if(good.isReq) return
      

      //一旦经过看门狗,就说明现在没有请求,但是马上开始请求了,我们要设置当前正在发送修改请求
      good.isReq = true

      //判断如果是减少数量的话,则判断临界值
      if(num === -1 && good.skuNum <= 1) return (good.isReq = false)

      //发送修改数量请求
      await reqAddOrUpdateCart(good.skuId, num)

      //重新发送请求
      await this.getCartList()

      // 必须等待最新的数据请求回来,设置当前发送修改数量请求已经结束,并且拿到最新数据,下次判断就能使用最新数据判断了;
      good.isReq = false
    }

    },
    computed:{
       //计算商品的总数量
    allNum() {
      return this.cartList.reduce((p, c) => p + c.skuNum, 0);
    },
    //计算商品总价钱
    allPrice() {
      return this.cartList.reduce((p, c) => p + c.skuPrice * c.skuNum, 0);
    },
    //商品的全选状态
    allChecked: {
      get(){
        return this.cartList.every((item) => item.isChecked === 1)
      },

      async set(value){
        const skuIdList = this.cartList.map((item)=>item.skuId);
        
        await reqCartAllChange(value ? 1 : 0 , skuIdList);

        this.getCartList();
      }
    }

    }
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 4.1667%;
          }

          .cart-list-con2 {
            width: 25%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

          .cart-list-con3 {
            width: 20.8333%;

            .item-txt {
              text-align: center;
            }
          }

          .cart-list-con4 {
            width: 12.5%;

          }

          .cart-list-con5 {
            width: 12.5%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 12.5%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 12.5%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>